Why is the temperature of products likely to be lower than the temperature of reactants in an endothermic reaction?
Arriving back from school, you decide to microwave a Hot Pocket for a snack. You have a
1500W microwave that took 3 minutes to cook the Hot Pocket.
Answer:
Kristy thank you doing today hope you doing recently
Radio waves, ultraviolet rays, X-rays, and gamma rays are all examples of electromagnetic radiation, as are microwaves.
What is Microwave?There are several uses for microwaves, including for communications, radar, and—possibly for the most part—cooking. Waves or particles of electromagnetic radiation with various wavelengths and frequencies are communicated.
The electromagnetic spectrum (EM spectrum) is the name given to this wide spread of frequencies. In general, the spectrum is divided into seven areas in ascending sequence of increasing energy and frequency and decreasing wavelength.
Radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays, and gamma-rays are some of the common names for these types of energy. In the electromagnetic (EM) spectrum, microwaves are found between radio and infrared light.
Therefore, Radio waves, ultraviolet rays, X-rays, and gamma rays are all examples of electromagnetic radiation, as are microwaves.
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¿Cuál es la fórmula química del ácido perclórico?
Cuál es la fórmula química del ácido perclórico ?
[tex] \red{Answer}[/tex]fórmula química del ácido perclórico es HClO4.
Answer:
pls can I get a translation
Will mark the brainliest answer!!
If you cross a purebred pea plant with green seeds and a purebred pea plant with yellow seeds, what percent of their offspring will have green seeds?
A. 100 percent
B. 75 percent
C. 25 percent
D. 0 percent
Answer:
100%
Explanation:
assuming green is the dominant trait, 100% will have green seeds, but none will be purebred
this is a attachment from my text book can you help me
Answer:
Looks like a mitrochondria
Explanation:
A container has a volume of 2.79 L and a pressure of 5.97 atm. If the pressure changes to 1460 mm Hg, what is the container’s new volume?
Answer:
8.68 L is the new volume
Explanation:
You use Boyle's law for this.
[tex]P_{1}V_{1}=P_{2}V_{2}[/tex]
[tex]P_{1}[/tex] = first pressure
[tex]P_{2}[/tex] = second pressure
[tex]V_{1}[/tex] = first volume
[tex]V_{2}[/tex] = second volume
Convert pressure from atm to mmHg (use same units):
5.97 x 760 = 4537.2 -> 4.54 x 10³
...maintain 3 significant figures in calculation, and round as needed...
(4.54 x 10³ mmHg)(2.79 L) = (1460 mmHg)([tex]V_{2}[/tex])
(4.54 x 10³ mmHg)(2.79 L) / (1460 mmHg) = [tex]V_{2}[/tex] = 8.68 L
Hope this helps :)
I was wondering what the answer for this question would be ?
Answer:
C. H2O is the base and H3O+ is the conjugate acid
Explanation:
According to Bronsted-Lowry acid-base theory, an acid is a substance that loses an hydrogen ion or proton (H+) while a base is a substance that gains an hydrogen ion (H+) or proton. Furthermore, this theory states that, the molecule formed when an acid donates its proton is called the CONJUGATE BASE, while the molecule formed when the base accepts proton is called CONJUGATE ACID.
In this question, the following equation is given:
NH4+(aq) + H2O(aq) ⇌NH3(aq) + H3O+ (aq)
Water (H2O) is the base in this equation because according to Bronsted-Lowry acid-base theory, it accepts an hydrogen ion (H+) while hydroxonium ion (H3O+) is the conjugate acid.
77.33 grams of aluminum is heated from 155°C to 175°C. The specific heat of aluminum is 0.921
J/g °C. How much energy is required? Round to the nearest whole number.
Answer:
1424
Explanation:
Q=mco
Qis energy
M is mass
C is specific energy
O is temperature change
Substitute all the information you have in the equation then you will get the answer
A solution has a [OH−] of 1 × 10−12 M. What is the [H3O+] of the solution?
1 × 10−14 M
1 × 10−2 M
2 M
14 M
Answer: The awnser is B
Explanation:
An electric current transports 0.20 kC of charge in 14.0 minutes. Calculate the size of the electric current.
Be sure your answer has the correct unit symbol and the correct number of significant digits.
In the Reaction: Pb(NO3)2 + 2 Kl —> Pbl2 + 2 KNO3
How many grams of lead (II) iodide, Pbl2, is produced from 82.7 grams of potassium iodide, KI?
Round to two decimal places.
Answer:
114.8g PbI2 are produced
Explanation:
To solve this question we must convert the mass of KI to moles using its molar mass (KI = 166.0g/mol). As 2 moles of KI produce 1 mole of PbI2 we can find its moles and its mass (Molar mass PbI2: 461.01g/mol) as follows:
Moles KI:
82.7g KI * (1mol / 166.0g) = 0.498 moles KI
Moles PbI2:
0.498 moles KI * (1mol PbI2 / 2mol KI) = 0.249 moles PbI2
Mass PbI2:
0.249moles * (461.01g/mol) =
114.8g PbI2 are producedI don’t get it need some help please and thank you
Answer:
A. like poles of magnets repel each other
B. Unlike poles of magnets attract each other.
C. The magnet's force is stronger than the earth's at this distance
Explanation:
From the diagram given, we can take the portion of the compass painted red to be the north, and the porion painted white to be the south.
In the first diagram, the north of the compass gets attracted to the south of the compass showing, that unlike poles attract each other and like poles repel each other.
In the second diagram, the south of the compass needle gets attracted to the north of the magnet showing, that like poles repel each other, and unlike poles attract each other.
The mere fact that the compass needle is not pointing towards the north shows that it is being affected by the magnet placed beside it. Normally every compass held under the influence of the magnetic pull of the earth points north. But since this is not the case here, we can say that The magnet's force is stronger than the earth's at this distance
351 Joules of energy was released when a 12 gram sample of unknown metal with an initial temperature of 90 °C was cooled down to 25 °C Describe the direction of heat flow between the metal and the water. (4 pts)
Answer:
Naturely, the direction of the heat flow is from zone of high temperature to zones of low temperature. Hence, the direction of heat flow is from the sample of unknown metal and surrounding water until thermal equilibrium in the water-sample system is reached.
Explanation:
Naturely, the direction of the heat flow is from zone of high temperature to zones of low temperature. Hence, the direction of heat flow is from the sample of unknown metal and surrounding water until thermal equilibrium in the water-sample system is reached.
Consider the following equilibrium: 2 NO2(g) ⇌ N2O4(g) + Energy The equilibrium will shift to left as a result of... — BRAINLIEST will be rewarded to the first to answer with the correct answer.
Answer:
C.
Explanation:
The left side has 2 mols of gas and the right only has 1. Thus increasing volume (decreasing pressure) would shift the reaction to the left
How many moles of H2 gas are generated when 4.0 moles of Na react?
2Na + 2H2O --> 2NaOH + H2
Answer:
2 moles of H2
Explanation:
From the equation
2 mol Na gives 1 mol H2
When we have 4 mole of Na then we get 2 moles of H2
Answer:
1.204 × 1024
Explanation: i just did this question
Where can you find the glands that produce salivary amylase?
Select one:
a. In your throat
b. In your stomach
c. In your mouth
d. In your intestines
translate AgNO3+KI -> AgI+KNO3 to a sentence
Answer:
AgNO3 + KI -> Agl + KNO3 is a balance equations which states that When Silver Nitrate (AgNO3) mixed or combined with potassium iodide (KI) it results as Silver iodide (Agl) with Potassium nitrate(KNO3)
Hope it helps
The chemical equation: [tex]\rm AgNO_3 + KI \rightarrow AgI + KNO_3[/tex] represents a reaction between silver nitrate ([tex]\rm AgNO_3[/tex]) and potassium iodide (KI) that yields silver iodide (AgI) and potassium nitrate ([tex]\rm KNO_3[/tex]).
A chemical equation is a symbolic representation of a chemical reaction in the form of reactants and products.
In this reaction: [tex]\rm AgNO_3 + KI \rightarrow AgI + KNO_3[/tex]
The silver ion ([tex]\rm Ag^+[/tex]) from the silver nitrate combines with the iodide ion ([tex]\rm I^-[/tex]) from the potassium iodide to form solid silver iodide (AgI), which is a yellow precipitate. The nitrate ion ([tex]\rm NO^{3-}[/tex]) from the silver nitrate combines with the potassium ion ([tex]\rm K^+[/tex]) from the potassium iodide to form solid potassium nitrate ([tex]\rm KNO_3[/tex]), which is a white crystalline solid.
The chemical equation is balanced, with one atom of silver, one atom of iodine, one atom of potassium, three atoms of nitrogen, and nine atoms of oxygen on both sides of the equation.
Therefore, the balanced chemical equation: [tex]\rm AgNO_3 + KI \rightarrow AgI + KNO_3[/tex]represents a double displacement reaction between silver nitrate and potassium iodide that yields silver iodide and potassium nitrate.
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How does a catalyst increase reaction rate?
By increasing the activation energy
By increasing the amount of reactant
By increasing the contact between particles
By increasing the space between particles
What’s a element that is a non metal, contains 7 valance electron, 3 energy levels?
The answer is Cl.
Group/family 18, the Nobel Gases, have full octets of 8 valence electrons. Each time you move to the LEFT one time within the nonmetals on the Periodic Table, an electron is lost. So, any element in group/family 17 would have 7 valence electrons (you can check this by drawing Bohr diagrams for each element within group/family 17).
So, we now know that the element is a nonmetal found in group/family 17. Therefore, it is found in the "p" block. For elements found in the "p" block, periods represent energy levels.
Question 1
What would you do to balance this reaction?
N.
2
H₂
NH3
a
H
A. Double the coefficient of N2 (2 N2)
B. Multiply coefficient of H, by 3 (3 H2)
C. Multiply subscripts of Hy by 3 ( H.)
D. Double the subscripts for NH3 (N2H)
E. Double the coefficient of NH3 (2NH3)
Answer:
Explanation:
nm
Why is it that when you heat up a small portion of mac n cheese, it gets warmed up quickly and soon burnt. I heated up my bowl because it was getting cold, only a little in it and it got started poping after 1 second. Why is this?
another fun question, but for real, what does it mean?
Answer:
well tbh it's just the microwave doing its job heating up your Mac n cheese. But while doing so the Mac n cheese absorbs a lot of heat and then releases it by popping.
Answer:
I don't know
Explanation:
so true though
which of the following measurements involve a direction? ( select all that apply)
A. acceleration
B. velocity
C. distance
D. mass
what is NaOH element
Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na + and hydroxide anions OH −
A beach ball with a volume of 12.0 L and an initial temperature of 32.0 oC is cooled to -73.0 oC, what is its final volume?
Answer:
-57.12
Explanation:
i used a calculator :)
Answer:
-73
Explanation:
12.0+32.0=44-73.0=-73
examples of type of matter that_ through the environment are carbon, nitrogen, and water
Answer:
examples of type of matter that circulate through the environment are carbon, nitrogen, and water
what happened to the weather after mount tambora epurted?
Answer:
The eruption of Mount Tambora eventually reduced the average global temperature by as much as 3 °C.
Explanation:
The Mount Tambora eruption was the largest and most destructive volcanic event in recorded history, expelling as much as 150 cubic km (roughly 36 cubic miles) of ash, pumice, and other rock, and aerosols—including an estimated 60 megatons of sulfur—into the atmosphere. As that material mixed with atmospheric gases, it prevented substantial amounts of sunlight from reaching Earth’s surface, eventually reducing the average global temperature by as much as 3 °C.
Given the reaction below, how many grams of aluminum (Al) would be
formed from 5.0 g of Fe? Reaction: 9 Fe + 4 A1:0, --> 3 Fe:O. + 8 AIM
a. 0.0029 g AI
b. 2.1 g Al
c. 2.7 g AI
d. 4.4 g AL
1) Ions are formed between positive or negative charge.
2) Which one is not an ionic compound?
a) LiCl
b) MgBr 2
c) CaO
d) HCl
3) Write down chemical formula of ionic compound between Potassium (K) and Sulfur (S)?
4) How many valence electrons Group 1 elements have?
5) When group 1 element want to become stable by forming an ion, what will be its
charge?
6) How many valence electrons group 2 elements have?
7) When group 1 element want to become stable by forming an ion, what will be its
charge?
8) How many valence electrons group 16 elements have?
9) When group 16 element want to become stable by forming an ion, what will be its
charge?
10) List two properties of ionic compounds.
Answer:
1. No 1 looks like a statement and not a question.
2.Ionic compounds are usually formed from the transfer of electrons from metals to Non metals. All others are Ionic compounds except HCl(Its a covalent compound).
3. The Formula would be K2S. Exchange of Radicals takes place. Sulphur has a -2 charge and potassium has a +1 charge. when they both exchange radicals... The compound is K2S.
4.Group 1 elements have only 1 electron in their outermost shell.
5. its charge will be +1 because it loses the 1 electron in its outermost shell.
6.Group 2 elements have 2electrons in their Valence shell.
7.Already answered. same as No 5.
8. Group 16;Also known as group 6. They have only 6 electrons in their outermost shell.
9.When they want to become stable... they acquire 2electrons to complete their octet... so they possess a -2 charge by forming an ion.
10. i)They form ions when Dissolve in solutions
ii) They are hard and brittle
iii) They have high boiling points
What is the molarity of a solution prepared by dissolving 10.0 grams of NaOH in enough water to make a solution with a total volume of 2.40 liters?
O0.104 M NaOH
O0.201 M NaOH
O0.361 M NaOH
O0.412 M NaOH
Solution :
Molecular mass of NaOH is 23 g/mol .
So, number of moles of NaOH is given by :
[tex]n = \dfrac{10}{40}\ mole[/tex]
Now, we know molarity is given by :
[tex]Molarity = \dfrac{Number \ of \ moles\ of \ salute}{Volume ( in \ Liter ) }[/tex]
[tex]M = \dfrac{10}{40\times 2.4} \ M\\\\M = 0.104 \ M[/tex]
Hence, this is the required solution.
Answer: The answer is A O0.104 M NaOH
Explanation:
Which statements are true about physical changes? Select all that apply.
A.Physical changes are easily reversible.
B.An example is when wood burns and loses mass.
C.This is when atoms of an object change their state.
D.This is when there are changes between being a solid, liquid, or gas
Answer:
a
Explanation:
because physical changes are reversible while chemical changes are irreversible